A Novel Two-Dimensional Echocardiography Method to Objectively Quantify Aortic Valve Calcium and Predict Aortic...

Area of Science:

• Cardiology
• Medical Imaging
• Echocardiography

Background:

• Aortic valve calcium (AVC) is a key indicator of aortic stenosis (AS) severity.
• Current quantification relies on multidetector computed tomography (MDCT).
• Objective quantification of AVC using echocardiography is needed.

Purpose of the Study:

• To introduce and validate a novel method for quantifying AVC using 2D transthoracic echocardiography (TTE).
• To assess the ability of this method to differentiate severe from non-severe AS.
• To compare the novel method with existing echocardiographic parameters and MDCT quantification.

Main Methods:

• A novel pixel density quantification software was used on parasternal short axis aortic valve views from 90 patients.
• A gain-independent ratio (2D-AVC ratio) was calculated using end-diastolic aortic valve and aortic annulus pixel densities.
• The 2D-AVC ratio was correlated with hemodynamic parameters, MDCT AVC, and expert interpretation.

Main Results:

• The 2D-AVC ratio strongly correlated with mean AV gradient (r=0.72), peak AV velocity (r=0.74), and MDCT AVC (r=0.71).
• The method demonstrated excellent accuracy in distinguishing severe from non-severe AS (AUC=0.93).
• Expert interpretation of echocardiographic AVC showed no significant correlation with AS severity parameters.

Conclusions:

• The 2D-AVC ratio is a reliable and objective method for quantifying AVC via TTE.
• This novel ratio can serve as a valuable tool for AS severity assessment.
• The 2D-AVC ratio may complement existing methods for AS adjudication during TTE.